McCulloch, 55, is a former Oakland County board chairman and CPA, said he decided to get into the race because Stabenow, President Barack Obama and congressional Democrats were “mortgage(ing) America’s future on the backs of our children and their children’s children with a national debt so large it is difficult to comprehend.”

So now there are several Republican candidates running for the nomination, none of which have strong name recognition at this point (that's bound to change as the election for the nomination ramps up):

Several higher-profile Republican candidates declined to run against Stabenow (former U.S. Rep. Pete Hoeksta, U.S. Rep. Thaddeus McCotter, R-MI 11th district, and former Michigan Secretary of State Terry Lynn Land).

Gary Glenn of Midland announced today that he is thinking about a run for the Republican nomination to challenge Sen. Debbie Stabenow in 2012.

Glenn, 53, of Midland served as GOP Michigan delegate for a decade, is a veteran of the U.S. Army Reserves and has a pro-life stance. He has spoken at a dozen Tea Party events, including the 2009 Midland County Tea Party rally, and has served as the president of the American Family Association.